1. Hansen, E. and Schaffner, S. (eds.): 1978, Proc. OSO-8 Workshop, University of Colorado, Boulder.
2. Haskell, G. P. (ed.): Grazing Incidence Solar Telescope (GRIST), Report on the Phase-A Study, DP/PS(78)11, European Space Agency, Paris.
3. Huber, M. C. E. and Tondello, G.: 1979, Appl. Opt. 18, 3948.
4. Huber, M. C. E. and Withbroe, G. L.: 1979, in Proc. JOSO Workshop on Future Solar Optical Observations - Needs and Constraints, Osservazioni e Memorie dell'Osservatorio Astrofisico di Arcetri, Fasc. 106, p. 146.
5. Malvezzi, A. M., Garifo, L., and Tondello, G.: 1981, Appl. Opt. (in press).